Commit only to a skill test you are performing, and only if the difficulty of that test is at least 2 higher than your base skill value.
Three is fantastic. I love the restriction, it feels thematic and inline with other cards like Lucky!, Oops! and "Look what I found!". When it works it is incredibly helpful however I have found it a bit of a dead card often sacrificed to Wendy Adams ability. It's probably better including Unexpected Courage and other skill cards with more versatility rather than risk having a dead card in your deck.
Of the triple skills available at the time, I think that Rise to the Occasion is one of the more difficult ones to use. If the test is that much more difficult than your base skill level, then this card alone is probably not enough to guarantee a success - chances are you're going to need a little extra help.
Generally speaking, I'd normally rather have Unexpected Courage - it's one less icon, but it's much more flexible.
The exception, of course, is Calvin Wright. With base skill values that are all 0, he can use this card on almost every test. In most instances I think he's going to want to take this one with him!
Since no-one seems to have noticed, ill just point out that this card fits perfectly into any deck using Dark Horse, where it's restriction is suddenly "at least 1 higher". For Dark Horse Duke ("Ashcan" Pete), This is basically the perfect skill card to go with all your passive stat boosters.
Of course, Even for Dark Horse its basically a 3rd and 4th copy of Unexpected Courage.
This Card can be played after Double or Nothing, as it raises the difficulty (if the resulting difficulty is 2 higher than your base value). This card refers to the modified difficulty of a test, not the base value.